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Renesas ISL6561CRZA
- Part No.:
- ISL6561CRZA
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6561CRZA.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
ISL6561CRZA from Renesas Electronics (formerly Intersil) is a multi-phase PWM controller for VR10.x microprocessor core voltage regulation, driving up to 4 synchronous-rectified buck channels with precision rDS(ON) or DCR differential current sensing. It delivers ±0.5% system accuracy over life, load, line, and temperature; supports 2/3/4-phase operation; and achieves >4MHz ripple frequency for fast transient response in high-performance CPU power delivery.
For engineers reviewing the ISL6561CRZA datasheet, ISL6561CRZA pinout, ISL6561CRZA application, or ISL6561CRZA equivalent, key selection criteria include its programmable temperature-compensated current sensing, Dynamic VID™ compatibility, 40-pin QFN package, 0.8375V–1.600V 6-bit VID range, and integrated shunt regulator supporting both 5V and 12V biasing - all critical for Intel-compatible VR10.x VRM designs.
Technical Context
The ISL6561CRZA implements a multi-phase interleaved PWM architecture with independent channel current sampling during forced-off time (1/3 cycle), enabling precise per-channel droop programming and real-time current balancing. Its error amplifier features 80dB open-loop gain and 18MHz bandwidth, paired with a sawtooth oscillator (0.08–1.5MHz adjustable via FS resistor) and internal DAC referenced to VID inputs.
Current sensing operates via differential amplifiers on ISENx+/ISENx− pairs, supporting either MOSFET rDS(ON) (with virtual-ground ISEN+ tied to PHASE node) or inductor DCR (via external RC network). Temperature compensation is applied via TCOMP pin using an internal thermal sensor and programmable transconductance (1μA/V/°C), directly correcting for rDS(ON) or DCR drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phase Count | Configurable 2-, 3-, or 4-phase operation via PWM3/PWM4 pin strapping - determines interleaving timing and channel count without firmware change. |
| VID Range | 0.8375V to 1.600V in 12.5mV steps (6-bit input: VID0–VID4 + VID12.5) - enables full Intel VR10.x voltage positioning compliance. |
| System Accuracy | ±0.5% over life, load, line, and temperature (0°C to 85°C, VID = 1.2V–1.6V) - ensures tight output regulation under dynamic CPU load conditions. |
| Current Sensing Method | Differential rDS(ON) or DCR sensing with ±1% sensed current tolerance (80μA nominal) - eliminates need for sense resistors while maintaining channel-current balance accuracy. |
| Oscillator Range | 0.08 MHz to 1.5 MHz (set by FS-to-GND resistor) - allows optimization of efficiency vs. transient response and component size. |
| Thermal Compensation | Programmable transconductance of 1μA/V/°C at TCOMP pin - nullifies rDS(ON) or DCR temperature drift in droop programming. |
| Supply Support | Internal shunt regulator accepts 12V bias via 300Ω resistor (VCC clamped to 5.9V typ); also supports direct 5V ±5% supply - simplifies auxiliary rail design. |
Pinout & Package
ISL6561CRZA is housed in a RoHS-compliant 40-pin QFN package (6mm × 6mm, JEDEC MO-220 QFN outline, exposed thermal pad), optimized for high-density CPU VRM layouts with improved PCB efficiency and low profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary power supply input | Accepts 5V ±5% direct or 12V via 300Ω limiting resistor; powers all internal circuitry and enables shunt regulator operation. |
| EN | Threshold-sensitive enable input | Active-high logic (1.24V threshold); synchronizes startup with driver POR; fault reset occurs below 1.14V. |
| ENLL | Logic-level enable (QFN-only) | Secondary enable pin for fine-grained sequencing control; deassertion clears faults and primes soft-start. |
| PWM1–PWM4 | Phase gate-drive outputs | Open-drain PWM signals driving external MOSFET drivers; phase count set by strapping PWM3/PWM4 to VCC or GND. |
| ISEN1+ / ISEN1− … ISEN4+ / ISEN4− | Differential current sense inputs | Four independent pairs for per-channel rDS(ON) or DCR sensing; inactive channels left unconnected. |
| TCOMP | Temperature compensation scaling input | Resistor-to-ground sets compensation gain; enables full cancellation of rDS(ON)/DCR thermal drift in droop loop. |
| OFS | Offset current programming pin | Generates dc offset current (485–515mV or 2.91–3.09V depending on resistor connection) for precise load-line adjustment. |
| VID0–VID4, VID12.5 | 6-bit voltage identification inputs | Direct interface to CPU VID bus; supports Dynamic VID™ for seamless on-the-fly voltage changes during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote voltage sensing (VSEN/RGND/VDIFF) | Eliminates ground potential differences between controller and CPU, improving regulation accuracy and OVP/UVP trip consistency. |
| Programmable temperature-compensated current sensing | Uses internal thermal sensor and TCOMP pin to fully correct rDS(ON) or DCR drift - maintains ±0.5% droop accuracy across 0°C–85°C ambient. |
| Integrated shunt regulator for dual-bias support | Enables use of single 12V rail for both controller and drivers via external 300Ω resistor - reduces BOM count and layout complexity. |
| Dynamic VID™ technology with 6-bit interface | Allows real-time voltage adjustments during CPU state transitions (e.g., C-states), meeting Intel VR10.x specification for adaptive core voltage control. |
| Multi-level overvoltage protection (OVP) | OVP pin drives external crowbar device; thresholds configurable pre- and post-soft-start (200mV above VID, or fixed 1.63V/1.80V) - prevents CPU damage during fault events. |
Applications
| Server CPU Core VRM | Workstation GPU Power Delivery |
|---|---|
|
Use Scenario: High-current, multi-core Xeon or EPYC processor requiring tight voltage positioning and sub-100ns load-step response. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller managing four interleaved buck stages, generating synchronized PWM signals and closed-loop droop regulation. Use Value: Achieves >4MHz effective ripple frequency and ±0.5% system accuracy - minimizes output capacitance count while meeting Intel VR10.x transient specifications. |
Use Scenario: Dual-GPU or high-TDP workstation graphics card demanding robust current sharing and thermal-aware load-line tuning. IC Role / Device Role / Timing Role: Core voltage controller implementing DCR-based current sensing with TCOMP-driven temperature compensation across all phases. Use Value: Maintains balanced channel currents within ±3% across temperature via sampled-and-held ISEN signals - prevents thermal runaway in compact GPU modules. |
| AI Accelerator Board Power | High-Performance Computing (HPC) Node |
|
Use Scenario: FPGA or ASIC-based AI inference accelerator with dynamic workload-dependent voltage scaling. IC Role / Device Role / Timing Role: VR10.x-compliant controller executing Dynamic VID™ updates in real time, coordinating with host BIOS for voltage/frequency binning. Use Value: Enables seamless on-the-fly VID changes without power interruption - supports fine-grained power/performance optimization during ML model execution. |
Use Scenario: Dense HPC blade server requiring high-efficiency, space-constrained CPU power with long-term reliability. IC Role / Device Role / Timing Role: Multi-phase controller with remote sensing (VSEN/RGND) and integrated OVP/OC protection - eliminating need for external monitoring ICs. Use Value: Reduces component count by integrating shunt regulator, temperature compensation, and PGOOD logic - improves MTBF and simplifies qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6562CRZ | Same pinout and feature set but rated for -40°C to 85°C industrial temp range (vs. ISL6561CRZA's 0°C to 70°C); identical electrical specs and VID mapping. | Required for extended-temperature deployments such as telecom baseband or industrial edge servers where ambient exceeds 70°C. | Select ISL6562CRZ when operating ambient exceeds 70°C; otherwise ISL6561CRZA offers cost-optimized qualification for commercial-server applications. |
| RT8803AGQW | 4-phase controller with integrated MOSFET drivers; lacks DCR/rDS(ON) temperature compensation and has fixed 1.0V–1.5V VID range (no VID12.5). | Suitable for cost-sensitive embedded systems where thermal drift compensation is not required and VID flexibility is secondary. | Choose RT8803AGQW only if driver integration and lower BOM cost outweigh loss of precision droop control and extended VID range. |
Compared with ISL6561CRZA, ISL6562CRZ extends temperature range without functional trade-offs, while RT8803AGQW sacrifices droop accuracy and VID granularity for driver integration - making ISL6561CRZA the optimal choice for thermally stable, high-precision VR10.x implementations.
Availability
ISL6561CRZA is available at Aetrix Electronics and suitable for server CPU core VRMs, workstation GPU power delivery, AI accelerator boards, and high-performance computing nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6561CRZA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation, formed through the acquisition of Intersil, is a global semiconductor leader specializing in microcontrollers, analog power, and mixed-signal solutions for industrial, automotive, and datacenter applications.
The ISL6561CRZA belongs to Renesas' high-precision VRM controller product line, designed specifically for Intel VR10.x-compliant microprocessor core voltage regulation with emphasis on thermal stability, multi-phase scalability, and seamless VID compatibility.
FAQ
What is the operating temperature range for the ISL6561CRZA?
The ISL6561CRZA is specified for an ambient operating temperature range of 0°C to 70°C. This commercial-grade rating aligns with typical server motherboard environments where airflow and thermal management keep local IC junction temperatures within safe limits. Its thermal resistance (θJA = 32°C/W) and maximum junction temperature of 150°C ensure reliable operation under sustained 12A–30A per-phase loads when properly heatsinked via the exposed QFN pad.
How does the ISL6561CRZA implement temperature compensation for rDS(ON) or DCR sensing?
The ISL6561CRZA uses an internal temperature-sensing element and the TCOMP pin to apply programmable compensation. A resistor from TCOMP to ground sets transconductance at 1μA/V/°C, scaling the compensation current injected into the droop loop. This directly counteracts the positive temperature coefficient of MOSFET rDS(ON) or inductor DCR, enabling full nullification of thermal drift in load-line programming - confirmed by ±0.5% system accuracy maintained across 0°C to 85°C.
Can the ISL6561CRZA support both rDS(ON) and DCR current sensing in the same design?
No - the ISL6561CRZA supports either rDS(ON) or DCR sensing per channel, but not both simultaneously in one configuration. The sensing method is determined by external circuitry: rDS(ON) requires ISEN− tied to lower MOSFET source and ISEN+ referenced to PHASE via RISEN; DCR requires ISEN− connected to RC network midpoint and ISEN+ to capacitor node. Mixing methods on different channels is not supported - all active channels must use the same sensing topology.
What is the purpose of the ENLL pin on the ISL6561CRZA?
The ENLL pin is a logic-level enable input exclusive to the QFN-packaged ISL6561 variants (including ISL6561CRZA). It provides a secondary, low-voltage enable path independent of the main EN pin, allowing precise sequencing control - for example, holding ENLL low until driver ICs are fully powered and ready, then asserting it to initiate soft-start. Deasserting ENLL clears all fault latches and resets the controller to initial state.
Does the ISL6561CRZA require external components for overvoltage protection?
The ISL6561CRZA integrates OVP detection circuitry but requires an external crowbar device (e.g., SCR or MOSFET) driven by the OVP pin to execute protection. No external comparators or reference circuits are needed - the OVP pin pulls low when voltage exceeds 200mV above VID (post-soft-start) or fixed thresholds (1.63V/1.80V pre-enable), directly enabling the external device to short VIN or VOUT to ground and protect the CPU load.
ISL6561CRZA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR10X
- Voltage - Input:
- 3V ~ 12V
- Number of Outputs:
- 4
- Voltage - Output:
- 0.84V ~ 1.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6561CRZA FAQ
1.How can I place an order for ISL6561CRZA through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6561CRZA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL6561CRZA reliable?
The price and inventory of ISL6561CRZA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6561CRZA is usually 5 days.
3.What payment methods are accepted for ISL6561CRZA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6561CRZA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6561CRZA?
ISL6561CRZA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6561CRZA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL6561CRZA?
For technical support, including ISL6561CRZA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6561CRZA requirements.
6.How does Aetrix verify that ISL6561CRZA is sourced from the original manufacturer or authorized distributors?
All ISL6561CRZA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL6561CRZA meets industry standards.
7.What is the process for return or replacement of ISL6561CRZA?
All ISL6561CRZA units undergo pre-shipment inspection (PSI). If there is an issue with ISL6561CRZA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL6561CRZA part is unused and in its original packaging.
Return procedure for ISL6561CRZA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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